A compound when treated with aqueous sodium hydroxide and warmed gives off a colourless gas which turns moist red litmus paper blue. The gas given off is

A compound when treated with aqueous sodium hydroxide and warmed gives off a colourless gas which turns moist red litmus paper blue.

The aqueous sodium hydroxide is acting as

A compound when treated with aqueous sodium hydroxide and warmed gives off a colourless gas which turns moist red litmus paper blue. The compound is MOST LIKELY

A piece of calcium is added to some distilled water in a container and the following observations are recorded.

- The reaction is rapid.

- Bubbles of gas evolve.

- A white suspension forms.

- Temperature increases.

The gas evolved would be expected to

Calcium forms a white suspension in water because its

Calcium forms a white suspension in water. A sample of the suspension is filtered and the pH of the filtrate determined. The expected pH of the filtrate should be approximately

Addition of hydrochloric acid to a solution of metallic nitrate gives a white precipitate which is insoluble in water but soluble in aqueous ammonia. The metallic nitrate is LIKELY to be

A colourless gas with a pungent odour turns blue litmus paper red and turns filter paper dipped in acidified potassium dichromate from orange to green.

This gas is

A white metallic hydroxide, X, undergoes no colour change when heated. It dissolves in both dilute sulfuric acid and sodium hydroxide solutions.

The metallic hydroxide is MOST likely

To positively identify sulfur dioxide gas, a strip of paper is soaked in an aqueous solution of